The chain — which also has bars in Islington and Brighton — today announced its first franchise deal, which will see private karaoke rooms based on its Poland Street bar put in bowling alleys across Britain.

Lucky Voice is also in talks with companies in America and elsewhere. Managing director Nick Thistleton said: "We are on the cusp of a dramatic expansion. We have had enquiries from all over the world, and there is scope for a lot more deals.

"We believe that bars, nightclubs and holiday destinations like cruise ships are perfect for private karaoke rooms. We think this is an absolute winner."

The Lucky Voice chain — which already has booths within Tiger Tiger bars in Manchester and Cardiff — employs 45 people, and most rooms are booked well in advance for the weekends. The rooms hold between four and 15 guests, who can choose from thousands of songs.

A home version of the Lucky Voice karaoke system sold out before Christmas. Users plug microphones into a computer and can download new songs online and set up playlists.

Mr Thistleton said: "We are planning to move the bars over to the same software as the home system, so you'll be able to choose the songs you want from your iPhone in the pub before you come in, for instance."

The first company to franchise the Lucky Voice system is Essenden, which runs 38 entertainment centres including tenpin bowling alleys, quasar laser arenas and pool halls.

The company plans to test the karaoke booths in four locations, which could include Kingston and Acton, before rolling them out across every venue. Although the rooms will not be branded as Lucky Voice, the "powered by lucky voice" logo will appear.

Essenden's chief executive Nick Basing said: "We're very excited and I'm thrilled we are doing this. We have a lot of big venues and karaoke is a good fit. We're incredibly pleased to be working with Lucky Voice as they are the market leaders and a great firm to work with.